Related-Key Differential Attacks on COSB-128 | Zendy

Song Dat Phuc Tran | Zendy; Changhoon Lee | Zendy

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Related-Key Differential Attacks on COSB-128

Author(s) -

Song Dat Phuc Tran,

Changhoon Lee

Publication year - 2015

Publication title -

international journal of distributed sensor networks

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.324

H-Index - 53

eISSN - 1550-1477

pISSN - 1550-1329

DOI - 10.1155/2015/617972

Subject(s) - block cipher , computer science , impossible differential cryptanalysis , differential cryptanalysis , linear cryptanalysis , higher order differential cryptanalysis , key (lock) , differential (mechanical device) , key schedule , block (permutation group theory) , cryptanalysis , key size , encryption , theoretical computer science , algorithm , cryptography , computer security , public key cryptography , mathematics , geometry , engineering , aerospace engineering

COSB-128 (Moldovyan et al., 2002) is a block cipher with 128-bit and 256-bit secret keys, which use key and data-dependent operational substitutions in fast controllable permutation blocks (CPB) concept. It is designed with a simple key schedule to ensure a high speed of data transformation by fast block encryption algorithms and expected to be high stability to all known methods of cryptanalysis, especially differential and linear attacks. In this paper, we show that the COSB-128 block cipher still remains weaknesses to differential related-key cryptanalysis, by constructing two full 10-round related-key differential characteristics (DCs) of COSB-128 with high probabilities, and thence propose our two related-key differential attacks. The attacks require about 224 data and time complexities to recover 63-bit key information and 222 data and time complexities to recover 6-bit key information. This study is the first known cryptanalytic result on COSB-128 until now. From this study, the new potential for the cryptanalysis on these types of block cipher will be further revealed.

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